Concentrating-jig.



' M. C. SEAGRAVB.

CONCBNTRATING JIG.

APPLIQATION FILED SEPT.22, 1911.

3 SHBETS-SHEET 1.

Illl

WIT/VESSES: /N VEN TUR ATTORNEY M. C. SEAGRAVB. GONGENTRATING JIG.APPLICATION FILED SBPT.2`2, 1911.

1,079,905. Patented Nov. 25, 1913. i" l 3 SHEETS-SHEET 2,

llil l ll IIIIIIL; l

WITNESSES:

A TTU/MIEI M. C. SEAGRAVE.

GONCENTRATING JIG.

`APPLICATION FILED m1111222, 1911.

Patented Nov. 25, 1913.

3 SHEETS-SHEET 3.

Qfff/f@ 'MABSHA'L C. SEAGBAVE, OF OAKLAND, CALIFORNIA.

CONCENTRATING-J IG.

Specieation of Letters Patent.

Patented Nov. 25, 1913.

Application filed September 22, 1911. Serial No. 650,740. I

To all whom t may concern:

Beit known that I, MARSHAL C. SEAGRAVE, a citizen of the United States,residing at Oakland, in the county of Alameda and State of California,have invented certain new and useful Improvements in Concentrating-Jigs,of which the following is a specification.'

The invention relates to that class of machines, adapted for theelimination of the worthless gangue in the Amineral bearingA mass, andparticularly to such machines wherein the separation or elimination ofthe worthless material is accomplished without the use of water;intermittent air currents or jets being commonly employed inconnecl`lonl with an agitation of the suspended frame for the separationof the mineral bearing earths and ores, one of such constructed machinesbeing disclosed by United States Letters Patent No. 994,406, granted J.B. Jardine, Jr., June 6, 1911.

0n account of the general low value of the ores worked under the systemof dry concentration or separat-ion, the cost incident thereto mustbelow per ton to permit of the same being proiitably worked toadvantage, and for this purpose it is required to provide a machinehaving large capacity for the preliminary treatment or separation oisuch materia-l in order to successfully and economically handle lowgrade deposits of mineral bearing material and to 'properly and cheaplyprepare the same for true concentration.

The present invention resides mainly in the construction of means torrapidly and f-iiiciently taking care oit the concentrates or separatedvalues, so that large quantities ot .material may be treated with amachine et ordinary size, the object being to provide for an increase inthe tonnage treatment without in any manner restrictingthe separatingsurface of themencentrator or separater, and this without undulyenlarging the working area oi the machine, which must be confined withincertain limits.

To comprehend the invention reference should be had to the accompanyingsheets ot drawings, wherein- Figure 1 is a side elevation, partlysectioned, of my jig, showing the application and positioning et theoutiet bins or hoppers for the jigged material, and the means forregulating the discharge therefrom, said view illustrating the means forsupplying intermittent air currents or jets to the under surface of thescreened units or sections of the concentrating bed and for removing thedust ladened air, the feed device for supplymg material to be treatedonto the concentrating bed, and the discharge for the gangue eliminatedfrom the metal bearing material. Fig. 2 is a cross sectional view,enlarged, of the table taken through one of the riifles thereof,illustrating the adjustable cradle and the shaking frame supporting theconcentratingr table, said view being taken on t-he line m--Fig. l ofthe drawings. Fig. 3 is a cross sectional view,- enlarged, of the tabletaken through one of the screened sections or units, disclosing theapplication of the air currents or jets to the under surface thereof.'Fig. 4 is a plan view of the jig frame. Fig. is an end elevation of theapparatus viewed from the discharge end thereot, Fig. 64 is a4 verticalsectional View of the pulsator.

.The vibrating jig frame is composed of two spaced longitudinallydisposed supporting side sills 1 and the upwardly extended side plates 2bolted or fastened thereto in' any suitable manner. The said jig frameis provided with a concentrating bed or top consisting of a series ofindependent transversely vdisposed separated screened sections or units3, the frame i for each section or unit being fastened between and tothe side plates 2, and the bottom of the jig is formed of an imperviousplate 5 which lies and is secured between the baseiianges 6- of thesideplates 2 and the' upper surface of the longitudinal side sills l, theends of said bottom plate 5 being united to the -end plates- 7 of thejig Jframe, so as to form a hollow chamber for the interior of the jig,which may or may not be d-ivided.

Fitted to the jig top in the intervais between the screened sections orunits 3 and serving as a seat for the frames thereof are thetransversely disposed downwardly extended bins or hoppers 8. A. numberof such bins or hoppers are provided throughout the length oi the jig,and they are open at the top to the full width ot' the jig and the mouthof each bin or hopper at its upper edge a is on a level with the uppersurface of the screened section or unit 3 the trame of which is seatedtherein, while the lower edge 7) of the same is projected tor a slightHtl separation of the material is not broken up,

or destroyed. In the present case the bins or hoppers 8 extend throughthe hollow chamber of the jig and sub-divide thesame into a series ofindividual compartments 9, and each bin or hopper is projected adistance below the bottom plate 5. The outlet for the said bins orhoppers is a contracted one, and the flow of material therefrom ispreferably controlled by a regulating valve 10, which is provided foreach of the said bins or hoppers.

The jig frame is supported or suspended above a suitable bed orfoundation 11, from which rise the stanchions 12. From the overhang 13of each stanchion a flat spring 14e projects downwardly, one beingattached to each corner piece l5 of an adjustable cradle 16 with aninclination downwardly, on which cradle rests or is supported the jigframe. The cradle 16 is adjustably united to the corner pieces 15 bymeans of the slotted heads 17 which slide on the guide web or flange 18projecting inwardly from the corner pieces 15 and are connected theretoby the bolts or pins 19 inserted through the holes or openings in theheads when in registry with any one of the vertical series of holes oropenings in the web or flange 18 d of the corner pieces 15. Theinclination of the cradle may thus be varied as desired to chan` e theinclination of the jig supported there y in accordance with thematerial'under treatment.

In order-to impart a side shake or vibratory motion to the cradle andjig supportedthereby, there is a drive shaft 2O situated and working 1nbearings at one side of the machine, and connected through eccentrics 21to the cradle by means of the cross-heads- 22, Figs. 1 and 5 of thedrawings. The rotary motion of the crank shaft is thus transmitted forimparting a lateral shaking or vibrating motion to the jig supported bythe suspended cradle.

l The separating bed or jig is inclosed by a hood 23 the outlet flue 23.of which is connected by a flexible joint 24 to a pipe 25 leading to asuction fan 25 for drawing od the dust ladened air, and the material t0be treated is delivered at the head end of the .said bed by a conduit 26leading from a trough 2G which receives the material from a feed hopper27, the material being forced from the trough 26 into the conduit 26 bya worm conveyer 27.

Intermittent air jets are supplied to the under surface of each screenedsection or unit 3 Vfrom a blower 28, which delivers air into a pulsator28', the said pulsator in turn delivering intermittent blastsalternately into the branch air supply pipes 29 and 29, which areconnected by flexible joints 30 and 30 to the delivery pipes 31 and 31which distribute the air into the air receiving chambers of the jig. Asusual with this form of air supply, .the How of air through the pulsatorinto the` delivery pipes is controlled by a rotary valve 32, driven inany suitable manner, so that while air is being admitted into onechamber of the pulsator, it is being released from the companionchamber, and the yintermittent air currents -thus supplied to theinterior of the jig chamber act to slightly vibrate the screenedcoverings of the screened sections or units composing the top of thejig, thereby maintaining the material traveling there over in agitation.

In operation, as the material to be treated is fed onto the head end ofthe jig the same at once is spread out uniformly over the screenedsurface of the first screened section or unit and, combined with theflow of the material down the inclination of the jig, together with theside shake of the table and the air pulsations and the air releases,

v the said material by reason of the natural differences in specificgravity arranges itself with .the heavier particles nearest the screenedsurface. The heaviest material during the course of downward movementwill flow into the open mouth of the depending jig bins orhoppers,theiarrested movement by reason of the barriers offered by thetransverse projecting rifles giving ample time for such material tosettle within the mouth of the jig bins. Inasmuch as these jig bins orhoppers are attached to the jig frame and move Awith the lateral ,shakethereof, the material discharging therein constantly assumes a levelsurface, and thus overcome the natural vortices in the center usuallycaused by the emptying of bins. The destruction, or rather thepreventing of the formation of .vortices in the bins permits .of adischarge of separated material in proportion to the inflow thereof,inasmuch as a clogging of the bins is provided against.

j By the employment of a plurality of downwardly projected jig bins orhoppersl dimensions than dpossible by the employment of tables proviwith transversely disposed troughs having a lateral discharge, for thecapacity of such tables is limited to the* capability of the dischargingmeans to handle or take care of the received material. Again, withtables constructed as described in mentioned United States LettersPatent No. 994,406 of June 61911, the width of the table is materiallylimited, for if the transversely arranged discharge worms are carriedbeyond a given length they will sag within the receiving trough and thusclog the outflowing material, and i'f supporting bearings be employedwithin the troughs they will prevent t-he free discharge of material. Onthe contrary a shaking table constructed with downwardly projecteddischarging jig bins or hoppers may be constructed of any desired width,inasmuch as they form a portion of the jig frame and a support for thescreened sections or units thereof, and the length thereof may beincreased or decreased in proportion to the working tonnage of materialrequired by merely adjusting the height of the supporting cradle for thejig frame. By thus providing for the working of large tonnage permachine, provision is made for the working of material running so lowinvalues per ton as otherwise could not be worked successfully orprofitably. 1 j

The tailing orl gangue Hows from the machine through the dischargeoutlet 32, extended from the discharge end of the jig.

The feature believed to be new and which it is desired to be understoodas claiming broadly resides in the employment of a plurality oftransversely disposed downwardly extended jig bins or hoppers projectedfrom a vibratory jig, having a working surface or bed composed ofseparated transversely disposed i independent .screened sections orunits, the jig bins or hoppers having a contracted outletfor thedischarge of the material received therein.

Having thus described the invention what is claimed as new and desiredto be protected by Letters Patent isl. In an apparatus for the describedpurpose, the combination of a jig-frame inclined in the direction of itslength, means for imparting a vibrating motion thereto, a series oftransversely disposed spaced screened sections secured within andarranged throughout the length of the said frame, and a series oftransversely disposed ope top and bottom discharge bins let into theframe throughout thelength-thereof intermediate the screened 'sections'and servin as downward discharges for the materia separated on thescreened surface of the vibratoryframe, each of said bins bein providedwith a contracted outlet and projected below the surface of the saidframe.

2. In an apparatus for the concentration of material, ythe combinationwith a jig frame, of means for imparting vibratory motion thereto, ascreened concentrating surface for the said frame, devices fordelivering thereon material to be worked, means for supplyingintermittent blasts of air under pressure to the screened surface of theframeand a transversely disposed downwardly extended open top and bottomdischarge bin let into the under face of the frame adjacent the lowerend of the screened surface thereof for receiving the separated materialfiowing therefrom and serving as a discharge therefor, the said binbeing provided with a contracted discharge outlet.

3. In an apparatus for the described purpose, the combination with theji frame having a sepa-rating bed composed o a series of transverselydisposed spaced screened sections arranged throughout the length of theframe, of devices for supplying material to be separated lonto said bed,means for imparting a vibratory motion to the jig frame, an open topdisc arge bin having a contracted outlet let into the frame intermediatethe screened sections thereof and projected a distance below the frame,each bin extended the ent-ire width of the screened sections of theseparating bed, and each bin having a section extended above the loweredge of the screened sections to form a series of trans,-

verse riiies for the separating bed of the jig frame, and means forsupplying intermittent blasts of air under pressure to 4the screenedsections ofthe separating bed.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

MARSHAL C. SEAGRAVE. Witnesses:

'N'. A. ACKER,

D. B. RICHARDS.

